feat: added warning for missing plan in goal

ref: N25B-450

src/pages/VisProgPage/visualProgrammingUI/nodes/GoalNode.tsx

@@ -1,8 +1,10 @@
 import {
   type NodeProps,
   Position,
-  type Node,
+  type Node
 } from '@xyflow/react';
+import {useEffect} from "react";
+import type {EditorWarning} from "../components/EditorWarnings.tsx";
 import { Toolbar } from '../components/NodeComponents';
 import styles from '../../VisProg.module.css';
 import { TextField } from '../../../../components/TextField';
@@ -44,7 +46,7 @@ export type GoalNode = Node<GoalNodeData>
  * @returns React.JSX.Element
  */
 export default function GoalNode({id, data}: NodeProps<GoalNode>) {
-  const {updateNodeData} = useFlowStore();
+  const {updateNodeData, registerWarning, unregisterWarning} = useFlowStore();
   const _nodes = useFlowStore().nodes;
 
   const text_input_id = `goal_${id}_text_input`;
@@ -64,6 +66,24 @@ export default function GoalNode({id, data}: NodeProps<GoalNode>) {
     updateNodeData(id, {...data, can_fail: value});
   }
 
+
+  useEffect(() => {
+    const noPlanWarning : EditorWarning = {
+      scope: {
+        id: id,
+        handleId: undefined
+      },
+      type: 'PLAN_IS_UNDEFINED',
+      severity: 'ERROR',
+      description: "This triggerNode is missing a plan, please make sure to create a plan by using the create plan button"
+    };
+
+    if (!data.plan){
+      registerWarning(noPlanWarning);
+      return;
+    }
+    unregisterWarning(id, noPlanWarning.type);
+  },[data.plan, id, registerWarning, unregisterWarning])
   return <>
     <Toolbar nodeId={id} allowDelete={true}/>
     <div className={`${styles.defaultNode} ${styles.nodeGoal} flex-col gap-sm`}>